Bump next from 14.2.15 to 15.3.1

Bumps [next](https://github.com/vercel/next.js) from 14.2.15 to 15.3.1.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v14.2.15...v15.3.1)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 15.3.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package.json

@@ -51,7 +51,7 @@
     "front-matter": "^4.0.2",
     "geist": "1.3.1",
     "lucide-react": "^0.456.0",
-    "next": "14.2.15",
+    "next": "15.3.1",
     "next-mdx-remote": "^4.4.1",
     "next-themes": "0.3.0",
     "posthog-js": "^1.180.1",